As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PARKING AT GATE, THE LEAD FA ADVISED THAT THE AFT FLIGHT ATTENDENTS COULD DETECT A DIRTY SOCK ODOR STARTING IN THE AFT GALLEY AND MOVING FORWARD THROUGH THE CABIN. ODOR DISAPATED ON GROUND. PERFORMED IDENTIFICATION OF THE CAUSE OF CABIN ODOR IAW TSM 05-50-00-810-831-A. PERFORMED ENG RUNS NO EVIDENCE OF ODOR IN AIRCRAFT. ACFT OK FOR SERVICE, NO FAULTS.